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$ \sqrt{\N a}= \sqrt{a} \t i$

Theory

-a=ai \sqrt{\text{-} a}= \sqrt{a} \cdot i

The square root of a negative number is not real, but it can be written as an imaginary number. -4=4i=2i \sqrt{\text{-}4}=\sqrt{4}\cdot i=2i Thus, the square root of -a\text{-} a can be written as the square root of aa multiplied by the imaginary unit.